Unintentional accidents are very common in children and the main reason for consultation hospitalization paediatric surgery. Aim: To determine factors associated with unintentional resulting hospitalization. Material methods: This is a cross sectional study carried out Paediatric Surgical Emergency Department of Children's Hospital Rabat over period 4 years. We processed 1205 children's files; ...

We investigate Kac's many-particle stochastic model of gas dynamics in the case hard potentials with a moderate angular singularity, and show that noncutoff particle system can be obtained as limit cutoff systems, rate independent number particles $N$. As consequences, we obtain wellposedness result for corresponding Boltzmann equation, convergence $N\rightarrow \infty$.